Feedback
Home
1. Trigonometry:
   
 
In a right angled
OAB, where
BOA =
,  
   
 
 
     
  (i)
sin
=
Perpendicular
Hypotenuse
=
AB
OB
;  
     
  (ii)
cos
=
Base
Hypotenuse
=
OA
OB
;  
     
  (iii)
tan
=
Perpendicular
Base
=
AB
OA
;  
     
  (iv)
cosec
=
1
sin
=
OB
AB
;  
     
  (v)
sec
=
1
cos
=
OB
OA
;  
     
  (vi)
cot
=
1
tan
=
OA
AB
;  
     
2. Trigonometrical Identities:
   
 
  i.
sin2
 + cos2
 = 1  
     
  ii.
1 + tan2
 = sec2
   
     
  iii
1 + cot2
 = cosec 2
   
     
   
3. Values of T-ratios:
   
 
0°
(
/6 )
30°
(
/4 )
45°
(
/3 )
60°
(
/2 )
90°
sin
0
1
2
1
2
  3
2
1
cos
1
  3
2
1
2
1
2
0
tan
0
1
3
1
3
not defined
   
4.

Angle of Elevation:
 
   
  Suppose a man from a point O looks up at an object P, placed above the level of his eye. Then, the angle which the line of sight makes with the horizontal through O, is called the angle of elevation of P as seen from O.
   
 
  Angle of elevation of P from O =
AOP.          
   
5. Angle of Depression:
   
 
   
  Suppose a man from a point O looks down at an object P, placed below the level of his eye, then the angle which the line of sight makes with the horizontal through O, is called the angle of depression of P as seen from O.
   
 
  © 2024 infibee.com. All Rights Reserved.   Copyright | Privacy Policy | Sitemap  
Contact us on : info@infibee.com  
 
 
Share   Facebook   Twitter   Google +   Digg